Digital read sampling rate help

Projects Programming
1

Hi There,

Just a quick question, does anyone know what the digital read sampling rate is for the arduino uno?

Thanks in advance!!

2

It is about 4uS.
If that is too long for you then use direct port addressing, it comes down to about four clock cycles.

3

You could just test it. Something simple like this (divide your answer by 8 )

void setup()
{
Serial.begin(9600);

unsigned long start=micros();
digitalRead(1);
digitalRead(2);
digitalRead(3);
digitalRead(4);
digitalRead(5);
digitalRead(6);
digitalRead(7);
digitalRead(8);
unsigned long end=micros();
Serial.println(end-start);
}

void loop(){}
4

Thats great thanks for all the replies!! most helpful :slight_smile: